With the help of high technology, many new substances（物质）______in the past years
题型：不详难度：来源：
With the help of high technology, many new substances（物质）______in the past years.| A．discovered | B．have discovered | C．had been discovered | D．have been discovered |
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答案
| D |
解析
| 考查时态语态：时间是in the past years.时态用现在完成时，new substances和discover是被动关系，句意是：随着高科技的发展，在过去的这些年里，很多新的物质被发现了。选D。 |
举一反三
She said that I could use her car while mine _________________.| A．was repaired | B．repaired | C．was being repaired | D．would be repaired |
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. ---- Do you know our hometown at all?
---- No, this is the first time I ____ here.| A．was | B．have been | C．came | D．am coming |
|
. ---- How long ____ at this job?
---- Since 1990.| A．were you employed | B．have you been employed | | C．had you been employed | D．will you be employed |
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– Why isn’t the recorder ready yet?
--- I’m sorry, sir. It ______ in the factory.| A．is being repaired | B．is repaired | C．has been repaired | D．hasn’t repaired |
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--When _________ the training course begin?
--Next Monday.| A．has | B．is going to | C．does | D．did |
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